Compound for and process of surface finishing metallic articles



so STATES 11v GQMPWUNU FOR PROCESS SURFACE FINISG METALLIC ARTICLES Joseph Lupe, .llln, Bronx, N. Y.

No Drawing. Application April 9, 1938,

Serial N0. 201,107

9 Claims. (Q1. 51-278) This invention is for an improved process of and acids and require no subsequent washing or finishing the surfaces of metallic parts or articleansing with expensive metal cleaners. cles, such as zinc die castings, brass castings, In carrying out the invention the metal articles steel, nickel, gold, stainless steel, platinum and are preferably tumbled in a tumbling machine silver stampings/or castings by a mass tumbling with hard bony pellets together with a compound 5 method. including a hard coarse abrasive to effect a cut- The invention broadly comprehendsa dry procting down of the surfaces thereof so as to reess for cutting down and smoothening the surmove tool, grinding or sand marks or other defaces of metal articles by tumbling the same with fects. After the cutting down of the metal arti- 10 hard, bony pellets and an. abrasive compound cles, if the same are to be polished or burnished, 10 composed of an abrasive material and lubricatthey are tumbled with hard bony pellets and a ing and adhesive vehicles. compound including a hard fine abrasive and The invention further resides in a process of thereafter if it is desired to impart a high luster the character indicated in which the metal artito the metal articles, the same are tumbled with cles are tumbled in a dry mixture of hard, bony absorptive fibrous fragments coated with a compellets, absorptive, fibrous fragments and an pound including a flour abrasive. 15 abrasive compound composed of an abrasive ma- The hard bony pellets employed in the cutterial and lubricating and adhesive vehicles. ting down and polishing operations preferably The invention also comprehends an improved consist of vegetable ivory chips, bone chips, syntumbling process for cutting down and smooththetic resin chips or hard tree root chips, while 20 ening the surfaces of the articles so as to rethe Compound includes an abrasive, a 1ubricatmovle tool, grinding and sand marks or other ing Vehicle and an e e Vehicle.

defects; for producing a mat or frosted finish metal Parts are devoid e 0 85 where the articles are to be immediately plated; the abraslve compmmd 1S P jffor obtaining a temporarily burnlshing or high ably applied to the surface of the absorptive luster finish, while coating or protecting the surfibrous fragmems Such as a Sawdust, Wood chllls faces against tarnishing, rusting, corrosion or of a partlfliles b (Boating the Same with the other discolorations if the articles are to be sub lubl'lcatmg Ve h1c1e wlflch ay be kerosene 0r u fl but not immediately plated and f any other equivalent light thin m neral Oil, and soproducing a permanent high luster finish if the 'then applyme thereto e abrasive or u tms articles are not to be platei material such as ground pum ce, emery, car- Th invention provides a process and borundum, precipitated chalk, infusonal earth,

, finely ground tripoli or other flour abrasive which pounds for the finishing of the surfaces of meis bonded to the fibrous fragments by the i moles or parts hf fimshmg hesive vehicle which may consist of tallow, pet- 35 .138 more economically accomplished than with mlatum or other fatty substances the hand process heretofore employed by virtue The tumbling barrel is approximately half of which Process a Superior and more uniform filled with the metal articles, pellets or pellets surface finish is obtained, while eliminating detand fibr u fragment in t proportion of aprimental overheating of the metal resulting in proximately on part of metal articles to two burns and spots whic quently are not disparts of the pellets and fragments or two and closed until the surface is plated. one-half parts thereof by volume so as to provide As a further advantage the articles processed a body in which the metal articles are embedded by the compounds and method of this invention and individually surrounded to avoid sharp im- 5 are positively devoid of dangerous sharp edges pact and rough tumbling of the metal articles fibrous fragments against each other, thus preventing marring or scratching of the same, while the pellets and effect a uniform abraiding' action of the abrasive material against the entire surface of each of the articles.

In the cutting down operation for removingtool, grinding or sand marks or other defects in metal articles, which are devoid of fine holes or threads, it has been found that practical andsatlsfactory results are expeditiously obtained by charging the tumbling barrel in the following proportions by volume:

Per cent Hard bony pellets such as vegetable ivory chips, bone chips, synthetic resin chips or hard tree root chips 65 Abrasive compound 10 Metal articles v The abrasive compound in this operation preferably consists of the following ingredients by volume: v

Per cent Absorptive fibrous fragments, such as hard wood granulated sawdust, wood chips or leather fragments 60 Kerosene or other equivalent light thin mineral oil v 10 Abrasive material and lubricating and adhesive vehicles- The abrasive material and vehicles preferably include the following ingredients by volume:

Per cent Hard coarse abrasive, such as ground pumice,

emery or carborundum of 180 to 200 mesh Lubricating vehicle, such as kerosene or other equivalent light thinmineral oil Adhesive vehicle, such as tallow, degras, mineral grease, chicken or animal fat or other fatty substances Adhesive vehicle, such as petrolatum or heavy mineral oil having a high viscosity 30 When the metal articles have fine holes or threads in which the fibrousfragments may become caked therein, the tumbling barrel is charged in the following proportions by volume:

1 Per cent Hard bony pellets, such as vegetable ivory Y chips, bone chips, synthetic resin chips or hard tree root chips '75 Abrasive material and vehicles 1 Metal articles 24 It will be observed that in this charging the absorptive fibrous fragments, such as the sawdust, wood chips or leather particles are eliminated in order to prevent clogging or caking of the fine holes or threads.

When the absorptive fibrous fragments are mployed in the operation, the same are coated with the kerosene or other equivalent light thin mineral oil, after which the abrasive material is applied thereto and then the adhesive vehicle, such as tallow and petrolatum or their equivalents applied over the surface of the abrasive to bond the same to the fibrous fragments.

When the absorptive fibrous fragments are not employed in the operation, the abrasive material is obtained by mixing together the aforesaid quantities of kerosene, tallow and petrolatum or their equivalents and then adding the proportion of abrasive specified and. the entire mass mixed into a homogeneous mash.

7a In the operation of polishing or burnishing greases metal articles which do not have fine holes or threads, after the same have been cut down by the operation described, the tumbling barrel is preferably charged in the following proportions. by volume:

' Per Hard bony pellets, such as vegetable ivory chips, bone chips, synthetic resin chips or hard tree root chips 85 Abrasive compound 10 Metal articles 25 The abrasive compound in this operation preferably consists of the following ingredients by volume:

' a Per cen Absorptive fibrous fragments, such as hard wood granulated sawdust, wood chips or leather fragments 42 Kerosene or other equivalent light thin mineral oil--- -10 Abrasive such as 320 to 400 mesh pumice,v

emery or carborundum 20 Abrasive material and lubricating and adhesive vehicles 28 The abrasive material and. lubricating and adhesive vehicles in this operation preferably include the following ingredients by volume:

Per cent Hard fine abrasive, such as pumice, emery or carborundum 19 oil Adhesive vehicle such as tallow, degras, red oil, steric acid or other fatty mineral or animal substances Adhesive vehicle, such as petrolatum or other heavy mineral oil In the polishing andburnishing operation,

the absorptive fibrous fragments having an outside coating of the adhesive material, such as the tallow and petrolatum or other equivalents, come into contact with the hard bony pellets and the metal articles when tumbled together therewith in a tumbling barrel so as to intimately coat the surfaces thereof with the said vehicle and the abrasive material thereby exposing the lubricat- Hard .bony pellets, such as vegetable ivory chips, bone chip synthetic resin chips or hard tree root chips Abrasive material and vehicles, 1 Metal articles 24 For imparting a. high luster to metal articles which do not have fine holes or threads, after the same have been subjected to the cutting.

down, polishing or burnishing operations, the

1 following proportions:

tumbling barrel is preferably charged in the following proportions by volume:

Per cent Absorptive fibrous fragments, such as wood pegs 75 Abrasive compound 1 Metal articles 24 The abrasive compound in this operation preferably consists of the following ingredients by volume:

Per cent Absorptive fibrous fragments. such as sawdust,

wood chips or leather fragments 72 Lubricating vehicle such as red oil 1 I Abrasive material and lubricating and adhesive vehicles"; 27

Lubricating vehicle, such as red oil 42 Adhesive 'vehicle, such as tallow, degras, mineral grease, chicken or animal fat or other fatty substances 25 Adhesive vehicle, such as heavy thick mineral oil For metal parts having fine holes or threads in which the sawdust may become caked therein, the tumbling barrel is preferably charged in the Per cent Wood p g 75 Abrasive material and vehicles 1 Metal articles- 24 As a substitute for the kerosene or light thin mineral oil in the abrasive compound for the cutting down and smoothening operations, the following may be employed:

same in a dry mass composed of hard bony pellets, absorptive fibrous fragments, and an abrasive compound consisting of abrasive material and lubricating and adhesive vehicles.

3. The process for finishing the surfaces of metal articles which consists in tumbling the same in a dry mass composed of hard bony pellets, absorptive fibrous fragments, and an abrasive compound consisting of abrasive material and lubricating and adhesive vehicles coated upon the fibrous fragments with the abrasive material disposed between the lubricating and adhesive vehicles.

4. The process for finishing metal articles which consists in first tumbling the same in a dry mass composed of vegetable ivory chips and an abrasive compound including a hard coarse abrasive and lubricating and adhesive vehicles to eiiect a substantial cutting downv and smoothening of the surfaces of the metal articles and then tumblingthe same in a dry mass composed of vegetable ivory chips and an abrasive compound including a hard fine abrasive and lubricating and adhesive vehicles to effect a polishing and burn-' ishing of the surfaces thereof.

1 5. The process for finishing metal articles which consists in first tumbling the same in'a dry mass composed of vegetable ivory chips and an abrasive compound including a hard coarse abrasive and lubricating and adhesive vehicles to eiiect a substantial cutting down and smoothen-v ing of the surfaces of the metal articles and then tumbling the same in a dry mass composed of vegetable ivory chips and an abrasive compound including a hard fine abrasive and lubricating and adhesive vehicles to effect a polishing andburnishing of the surfaces thereof, and thereafter tumbling the same in a dry mass composed of absorptive fibrous fragments and an abrasive compound including a fiour abrasive and lubricating and adhesive vehicles to impart a high luster to the surfaces thereof.

6. The process for finishing the surfaces of cent metal articles which consists in tumbling the Trisodium phosphate same in the approximate proportion by volume 45 Low rade so p of of metal articles with 75% of a dry mass T ll w 21 composed of vegetable ivory chips and an abrasive W t compound including an abrasive material and lubricating and adhesive vehicles.

7. A tumblingmaterial for finishing metal articles comprising a dry mass composed of hard bony pellets, absorptive fibrous fragments, and an In place of the kerosene and tallow ingredients in the abrasive material and vehicles in the cutting down and smoothening operations, the following may be employed:

, p cent abrasive compound including abrasive material T isodium phosphate 2 nd lubricating and adhesive vehicles. Low grade soap- 1o 8- A tumbling material for finishing metal ar- 55 Water 5 vtlcles comprising a dry mass composed of hard Tallow or animal fat l,. r 15 y pellets, absorptive fibrous fragments, and

an abrasive compoundincludingabrasive material andlubricating and adhesive vehicles carried by the fibrous fragments. so

9. A tumbling material forfinishing metal articles comprising a dry mass composed of vegetable-ivory chips, and an abrasive compound including abrasive material and lubricating and adhesive vehicles. JOSEPH LUPO, JR-

What is claimed is: w 1. The process for finishing the surfaces of metal articles which consists in tumbling the same in a dry mass composed of vegetable ivory chips and an abrasive compound including an abrasive material and lubricating and adhesive as vehicles. l

The process for finishing the surfaces of metal'articles which consists in tumbling the 

